Thermotropic copolymer hydrogels from N,N-dimethylacrylamide and methoxy-ethyl (meth) acrylate
US5057560A · kind A · utility
45Cited by
3References
13Claims
0Family size
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Key dates
| Filing date | May 21, 1990 |
| Grant date | Oct 15, 1991 |
| Priority date | — |
| Expiry date | May 21, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K9/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Novel thermotropic hydrogel forming polymers are described, which are ramdom copolymers of N,N-dimethyacrylamide with methoxy-ethyl acrylate or methacrylate. The linear polymers exhibit in water a lower-critical-solution-temperature (LCST) between 0.degree. and 70.degree. C. The water swelling of the crosslinked polymers is extremely temperature dependent and the gels show sharply defined clear to opaque transitions. The novel polymers are useful in drug delivery systems, absorption and extraction processes and as qualitative thermometers, thermosensors and self-activating sunscreens, for example for greenhouses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.